Lin Song, Yuan Meini, Zhao Bing, Li Beibei
College of Mechatronics Engineering, North University of China, Taiyuan 038507, China.
AVIC Manufacturing Technology Institute, Beijing 100015, China.
Materials (Basel). 2023 Jan 31;16(3):1241. doi: 10.3390/ma16031241.
The out-of-plane compression behaviour of 6061-T6 aluminum alloy super-stub honeycomb cellular structures without and with friction stir welding (FSW) facesheets are presented in this paper. A total of twelve axially compressed experiments on large-scale specimens, six with square hollow section (SHS) cores and six with hexagonal hollow section (HHS) cores, were conducted, with failure modes, ultimate resistances and axial load-end shortening curves analysed. The accuracy of finite element (FE) models was validated in accordance with test results. The numerical data obtained from extensive parametric analyses combined with test data were subsequently used to evaluate the applicability of existing design rules in Chinese, European and American aluminium alloy specifications. The results showed that the three specifications generally yielded very conservative predictions for the out-of-plane compression resistances of SHS and HHS super-stub honeycomb cores without and with FSW facesheets by about 30-37%. Design recommendations on the cross-section effective thickness are finally proposed and shown to provide much more accurate and consistent predictions than current design methods. The research results are beneficial to the application and development of large-scale super-stub honeycomb structures in structural engineering, such as the helicopter landing platforms, the base of fluid and gas tanks and ship decks.
本文介绍了不带搅拌摩擦焊（FSW）面板和带有搅拌摩擦焊面板的6061-T6铝合金超短蜂窝格构结构的面外压缩行为。对大型试件总共进行了12次轴向压缩试验，其中6个试件采用方形空心截面（SHS）芯材，6个试件采用六边形空心截面（HHS）芯材，并对破坏模式、极限抗力和轴向荷载-端部缩短曲线进行了分析。根据试验结果验证了有限元（FE）模型的准确性。随后，将从广泛的参数分析中获得的数值数据与试验数据相结合，用于评估中国、欧洲和美国铝合金规范中现有设计规则的适用性。结果表明，这三种规范对不带和带有FSW面板的SHS和HHS超短蜂窝芯的面外抗压强度预测通常非常保守，约低30-37%。最后提出了关于截面有效厚度的设计建议，结果表明，该建议比现行设计方法能提供更准确和一致的预测。研究结果有利于大型超短蜂窝结构在结构工程中的应用和发展，如直升机着陆平台、流体和气体罐基础以及船甲板等。
